Section to complete the data related to the clinical sites involved in the trial: site and responsible investigator for every site.
      Countries of recruitment: 
    
 
      Research ethics committees: 
    
            
                    Villa Clara, Universitary Hospital “Celestino Hernández Robau”, March 11, 2013. Havana, Center of Medical and Surgical Research (CIMEQ), March 21, 2013. Matanzas, José R. López Tabranes Hospital, February 27, 2013.